body {
    background-color: #979797
}


/* 固定宽度的容器 */

.container {
    width: 980px;
    /*80px*12 +20px =980px*/
    background-color: #fff;
    min-height: 800px;
    margin: 0 auto;
}


/* 定义行 */

.row {
    clear: both;
}

.col {
    float: left;
    margin-left: 20px;
    /*栅格系统的槽（gutter）*/
    width: 60px;
    background-color: #fd5353;
}

.col .span2 {
    width: 140px;
}

.col .span3 {
    width: 220px;
}

.col .span4 {
    width: 300px;
}

.col .span5 {
    width: 380px;
}

.col .span6 {
    width: 460px;
}

.col .span7 {
    width: 540px;
}

.col .span8 {
    width: 620px;
}

.col .span9 {
    width: 700px;
}

.col .span10 {
    width: 780px;
}

.col .span11 {
    width: 860px;
}

.col .span12 {
    width: 940px;
}